<div class="postDetail">
  <h5>Add new post:</h5>
  <form [formGroup]="form" (ngSubmit)="save()">
    <mat-input-container>
      <input matInput formControlName="title" placeholder="Title">
      <mat-error>This field is required</mat-error>
    </mat-input-container><br>
    <mat-input-container>
      <textarea matInput mat-autosize minRows="6" placeholder="Your post content..." formControlName="content"></textarea>
    </mat-input-container>
    <button mat-raised-button type="submit">Save</button>
  </form>
</div>